A new (t, n) Threshold signature Scheme withstanding the Conspiracy Attack

摘要

A ccmspiracy attack is proposed to show that Wang-Li's scheme is instcure, because any t or more group members can impersonate other t member to sign any message without holding the responsibility. To avoid the conspiracy attack, this paper prestentsa new (t,n) threshold signature scheme with traceablt signers. A (t. n) threshold signature scheme allows t or more group members of the group lo generate a signature on behalf of the group, Any less than t members cannot generate a valid signature, andany set of the group cannot impersonate another set of members to sign any message without holding the responsibility. In case of disputes., the threshold signature can be opened, so that the original signers ean be traced without repealing the secret keys.